Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

Resistance to effects of irradiation
Melting point, hence can be subjected to higher temperature
All of these
Density ; hence core volume for a given power output would be smaller

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Nuclear Power Engineering
The main purpose of control rod in a nuclear reactor is to control the

Conversion of fissile material into fertile material
Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Velocity of the secondary neutrons
Emission of hazardous radiation

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